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Vapor phase reduction of lead sulfide.

Authors

Cole-ER Jr.; Dressel-WM; Fine-MM

Source

NTIS: PB 234 687 1974 Jul; :1-11

Link

NIOSHTIC No.

10009277

Abstract

A lead smelting process that appears to present minimal pollution problems has been developed at the Bureau of Mines Rolla Metallurgy Research Center. Ten- and 100-g samples of pbs mill concentrates were vaporized at 1,000 deg to 1,100 deg c in a furnace with an inert gas atmosphere during a 2-hour period. The pbs vapor was transported by the inert carrier gas to the reduction zone of the furnace where it was reduced at the same temperature with excess hydrogen to metallic lead. Lead of 99.9-Pct purity was produced. The h2s formed can be decomposed into elemental sulfur and water vapor by a modified claus process. Approximately 90 pct of the cu and 70 pct of the ag and zn remain in the residue and are potentially recoverable. More than 98 pct of the lead in the concentrates was extracted.